JP6428046B2 - Noise reduction device and pneumatic tire provided with the same - Google Patents

Noise reduction device and pneumatic tire provided with the same Download PDF

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JP6428046B2
JP6428046B2 JP2014169870A JP2014169870A JP6428046B2 JP 6428046 B2 JP6428046 B2 JP 6428046B2 JP 2014169870 A JP2014169870 A JP 2014169870A JP 2014169870 A JP2014169870 A JP 2014169870A JP 6428046 B2 JP6428046 B2 JP 6428046B2
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band member
rib
noise reduction
circumferential direction
reduction device
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JP2016043824A (en
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金成　大輔
大輔 金成
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Yokohama Rubber Co Ltd
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Yokohama Rubber Co Ltd
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Priority to JP2014169870A priority Critical patent/JP6428046B2/en
Priority to CN201580031743.8A priority patent/CN106457900B/en
Priority to KR1020167027134A priority patent/KR101839768B1/en
Priority to US15/505,895 priority patent/US10668776B2/en
Priority to DE112015003852.3T priority patent/DE112015003852T5/en
Priority to PCT/JP2015/072679 priority patent/WO2016027724A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C19/00—Tyre parts or constructions not otherwise provided for
    • B60C19/002—Noise damping elements provided in the tyre structure or attached thereto, e.g. in the tyre interior
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/0681—Parts of pneumatic tyres; accessories, auxiliary operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B2900/00—Purpose of invention
    • B60B2900/10—Reduction of
    • B60B2900/133—Noise
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C2011/0337—Tread patterns characterised by particular design features of the pattern
    • B60C2011/0386—Continuous ribs
    • B60C2011/0388—Continuous ribs provided at the equatorial plane

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Description

本発明は、タイヤ内面に装着される騒音低減装置及びそれを備えた空気入りタイヤに関し、更に詳しくは、吸音材をタイヤ内面に固定する機能を損なうことなく軽量化を図ることを可能にした騒音低減装置及びそれを備えた空気入りタイヤに関する。   The present invention relates to a noise reduction device mounted on an inner surface of a tire and a pneumatic tire including the same, and more specifically, noise that enables weight reduction without impairing a function of fixing a sound absorbing material to the inner surface of the tire. The present invention relates to a reduction device and a pneumatic tire including the reduction device.

空気入りタイヤにおいて、騒音を発生させる原因の一つにタイヤ内部に充填された空気の振動による空洞共鳴音がある。この空洞共鳴音は、タイヤを転動させたときにトレッド部が路面の凹凸によって振動し、トレッド部の振動がタイヤ内部の空気を振動させることによって生じるものである。   In a pneumatic tire, one of the causes for generating noise is cavity resonance sound caused by vibration of air filled in the tire. The cavity resonance sound is generated when the tread portion vibrates due to road surface irregularities when the tire rolls, and the vibration of the tread portion vibrates the air inside the tire.

このような空洞共鳴現象による騒音を低減する手法として、タイヤとホイールのリムとの間に形成される空洞部内に吸音材を配設することが提案されている。より具体的には、タイヤ内面に沿うように環状に形成された熱可塑性樹脂からなるバンド部材に対して多孔質材料からなる吸音材を接合した騒音低減装置を構成し、そのバンド部材の弾性復元力を利用してタイヤ内面のトレッド部に対応する領域に吸音材を設置することが行われている（例えば、特許文献１，２参照）。   As a technique for reducing noise due to such a cavity resonance phenomenon, it has been proposed to arrange a sound absorbing material in a cavity formed between a tire and a rim of a wheel. More specifically, a noise reduction device in which a sound-absorbing material made of a porous material is joined to a band member made of a thermoplastic resin formed in an annular shape along the tire inner surface, and the elastic recovery of the band member is made. A sound absorbing material is installed in a region corresponding to the tread portion on the inner surface of the tire using force (see, for example, Patent Documents 1 and 2).

しかしながら、上述した騒音低減装置において、軽量化のためにバンド部材の厚さを減少させると、バンド部材の剛性が不足するため吸音材をタイヤ内面にしっかりと固定することができないという問題がある。そして、吸音材のタイヤ内面への固定が不安定になると、リム組み性が悪化したり、騒音低減装置がタイヤ走行に追従できずに破壊され易くなったりするという問題がある。   However, in the above-described noise reduction device, when the thickness of the band member is reduced for weight reduction, there is a problem that the sound absorbing material cannot be firmly fixed to the tire inner surface because the rigidity of the band member is insufficient. If the sound absorbing material is unstablely fixed to the tire inner surface, there is a problem that the rim assembling property is deteriorated, or the noise reduction device cannot follow the tire running and is easily broken.

特許第４１７５４７９号公報Japanese Patent No. 4175479 国際公開第２００５／０１２００７号International Publication No. 2005/012007

本発明の目的は、吸音材をタイヤ内面に固定する機能を損なうことなく軽量化を図ることを可能にした騒音低減装置及びそれを備えた空気入りタイヤを提供することにある。   An object of the present invention is to provide a noise reduction device capable of reducing the weight without impairing the function of fixing the sound absorbing material to the tire inner surface, and a pneumatic tire including the noise reduction device.

上記目的を解決するための本発明の騒音低減装置は、タイヤ内面に沿うように環状に成形された熱可塑性樹脂からなるバンド部材と、該バンド部材に対して接合された多孔質材料からなる吸音材とを有し、前記バンド部材の弾性復元力に基づいて前記吸音材をタイヤ内面に装着するようにした騒音低減装置において、前記バンド部材の厚さ方向の少なくとも一方の面に該バンド部材の周方向に延長する少なくとも１本のリブを設け、該リブを前記バンド部材の周方向の全域に存在するように配置すると共に、前記リブを前記バンド部材の外周面に配置し、前記リブのタイヤ内面に接触する部分に面取り加工を施したことを特徴とするものである。 In order to solve the above-mentioned object, a noise reduction device according to the present invention includes a band member made of a thermoplastic resin formed in an annular shape along an inner surface of a tire, and a sound absorbing material made of a porous material joined to the band member. In the noise reduction device that attaches the sound absorbing material to the tire inner surface based on the elastic restoring force of the band member, the band member has at least one surface in the thickness direction of the band member. At least one rib extending in the circumferential direction is provided, the rib is disposed so as to exist in the entire circumferential direction of the band member, the rib is disposed on the outer peripheral surface of the band member, and the tire of the rib The portion contacting the inner surface is chamfered .

また、本発明の空気入りタイヤは、上述した騒音低減装置を空洞部内に備えたことを特徴とするものである。   The pneumatic tire of the present invention is characterized in that the above-described noise reduction device is provided in the cavity.

本発明では、バンド部材の弾性復元力に基づいて吸音材をタイヤ内面に装着するようにした騒音低減装置において、バンド部材の厚さ方向の少なくとも一方の面に該バンド部材の周方向に延長する少なくとも１本のリブを設け、該リブをバンド部材の周方向の全域に存在するように配置したことにより、バンド部材の厚さを減少させた場合であっても、リブに基づいてバンド部材の曲げ剛性を十分に確保することができる。そのため、吸音材をタイヤ内面に固定する機能を損なうことなく軽量化を図ることができる。   According to the present invention, in the noise reduction device in which the sound absorbing material is attached to the tire inner surface based on the elastic restoring force of the band member, the band member extends in the circumferential direction of at least one surface in the thickness direction of the band member. Even when the thickness of the band member is reduced by providing at least one rib and arranging the rib so as to exist in the entire circumferential direction of the band member, the band member A sufficient bending rigidity can be ensured. Therefore, weight reduction can be achieved without impairing the function of fixing the sound absorbing material to the tire inner surface.

本発明において、リブはバンド部材の周方向の全域にわたって連続した構造を有することが好ましい。リブが周方向の途中で途切れていると、その部分に応力が集中してバンド部材が破壊され易くなるが、リブが連続した構造を有することにより、応力集中を回避し、良好な補強効果を得ることができる。また、リブをバンド部材の周長よりも短い複数のリブ片から構成することも可能であるが、この場合、バンド部材の周方向に隣り合うリブ片を互いに周方向に重複するように配置することが好ましい。これにより、リブが途切れた部位に応力が集中するのを可及的に回避することができる。   In the present invention, the rib preferably has a continuous structure over the entire circumferential direction of the band member. If the rib is interrupted in the middle of the circumferential direction, the stress concentrates on the part and the band member is easily broken. Can be obtained. In addition, the rib may be composed of a plurality of rib pieces shorter than the circumferential length of the band member. In this case, the rib pieces adjacent to each other in the circumferential direction of the band member are arranged so as to overlap each other in the circumferential direction. It is preferable. Thereby, it can avoid as much as possible that stress concentrates on the site | part in which the rib interrupted.

リブはバンド部材の外周面に配置することが好ましい。これにより、リブがタイヤ内面に当接する一方で、バンド部材はタイヤ内面に対して直接接触しなくなるため、タイヤ内面からバンド部材への熱伝達を抑制し、熱に起因してバンド部材の剛性が低下するのを抑制することができる。   The rib is preferably disposed on the outer peripheral surface of the band member. As a result, the rib member comes into contact with the inner surface of the tire while the band member does not directly contact the inner surface of the tire. It can suppress that it falls.

リブをバンド部材の外周面に配置するにあたって、リブのタイヤ内面に接触する部分には面取り加工を施すことが好ましい。これにより、リブの接触によるタイヤ内面の損傷を軽減し、空気入りタイヤの耐久性を向上するができる。   When arranging the rib on the outer peripheral surface of the band member, it is preferable to chamfer the portion of the rib that contacts the tire inner surface. Thereby, the damage of the tire inner surface by the contact of a rib can be reduced, and durability of a pneumatic tire can be improved.

リブの高さ及び幅の周上での変化量はそれぞれ最小値の２０％以下であることが好ましい。リブの高さ及び幅の周上での変化量が大きくなると、バンド部材の周方向の剛性変化が大きくなり応力集中が起き易くなるが、その変化量を規制することで応力集中を回避することができる。   It is preferable that the amount of change on the circumference of the height and width of the rib is 20% or less of the minimum value. When the amount of change in the circumference of the rib height and width increases, the stiffness change in the circumferential direction of the band member increases and stress concentration tends to occur, but stress concentration can be avoided by regulating the amount of change. Can do.

リブの合計幅はバンド部材の幅の２％〜３０％であり、リブの高さはバンド部材の厚さの２０％〜４００％であることが好ましい。これにより、バンド部材の耐久性を良好に維持しながら、リブに基づくバンド部材の補強効果を十分に確保することができる。   The total width of the ribs is preferably 2% to 30% of the width of the band member, and the height of the ribs is preferably 20% to 400% of the thickness of the band member. Thereby, the reinforcing effect of the band member based on the rib can be sufficiently ensured while maintaining the durability of the band member well.

本発明の実施形態からなる騒音低減装置を備えた空気入りタイヤを示す斜視断面図である。It is a perspective sectional view showing a pneumatic tire provided with a noise reduction device which consists of an embodiment of the present invention. 本発明の実施形態からなる騒音低減装置を示す斜視図である。It is a perspective view which shows the noise reduction apparatus which consists of embodiment of this invention. バンド部材に対する吸音材の接合方法を示し、（ａ）〜（ｃ）は各工程の断面図である。The joining method of the sound-absorbing material with respect to a band member is shown, (a)-(c) is sectional drawing of each process. 本発明で使用されるバンド部材の一例を示し、（ａ）はバンド部材を平面上に展開した展開図であり、（ｂ）はその横断面図である。An example of the band member used by this invention is shown, (a) is the expanded view which developed the band member on the plane, (b) is the cross-sectional view. 本発明で使用されるバンド部材の変形例を示し、（ａ）はバンド部材を平面上に展開した展開図であり、（ｂ）はその横断面図である。The modification of the band member used by this invention is shown, (a) is the expanded view which expand | deployed the band member on the plane, (b) is the cross-sectional view. 本発明で使用されるバンド部材の他の変形例を示し、（ａ）はバンド部材を平面上に展開した展開図であり、（ｂ）はその横断面図である。The other modification of the band member used by this invention is shown, (a) is the expanded view which expand | deployed the band member on the plane, (b) is the cross-sectional view. 本発明で使用されるバンド部材の他の変形例を示し、（ａ）はバンド部材を平面上に展開した展開図であり、（ｂ）はその横断面図である。The other modification of the band member used by this invention is shown, (a) is the expanded view which expand | deployed the band member on the plane, (b) is the cross-sectional view. 本発明で使用されるバンド部材の他の変形例を示し、（ａ）はバンド部材を平面上に展開した展開図であり、（ｂ）はその側面図である。The other modification of the band member used by this invention is shown, (a) is the expanded view which developed the band member on the plane, (b) is the side view. 本発明で使用されるバンド部材の他の変形例を示し、（ａ）はバンド部材を平面上に展開した展開図であり、（ｂ）はその横断面図である。The other modification of the band member used by this invention is shown, (a) is the expanded view which expand | deployed the band member on the plane, (b) is the cross-sectional view. 本発明で使用されるバンド部材の他の変形例を示し、（ａ）はバンド部材を平面上に展開した展開図であり、（ｂ）はその横断面図である。The other modification of the band member used by this invention is shown, (a) is the expanded view which expand | deployed the band member on the plane, (b) is the cross-sectional view. 本発明で使用されるバンド部材の他の変形例を示し、（ａ）はバンド部材を平面上に展開した展開図であり、（ｂ）はその横断面図である。The other modification of the band member used by this invention is shown, (a) is the expanded view which expand | deployed the band member on the plane, (b) is the cross-sectional view. 本発明で使用されるバンド部材の他の変形例を示す横断面図である。It is a cross-sectional view which shows the other modification of the band member used by this invention. 本発明で使用されるバンド部材の他の変形例を示す横断面図である。It is a cross-sectional view which shows the other modification of the band member used by this invention.

以下、本発明の構成について添付の図面を参照しながら詳細に説明する。図１は本発明の実施形態からなる空気入りタイヤを示し、図２は本発明の実施形態からなる騒音低減装置を示すものである。図１において、空気入りタイヤは、タイヤ周方向に延在して環状をなすトレッド部１と、該トレッド部１の両側に配置された一対のサイドウォール部２と、これらサイドウォール部２のタイヤ径方向内側に配置された一対のビード部３とを備えている。そして、トレッド部１とサイドウォール部２とビード部３とで囲まれた空洞部４には図２に示すリング状の騒音低減装置１０が装着されている。この騒音低減装置１０はタイヤ内面５のトレッド部１に対応する領域に配置されている。   Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows a pneumatic tire according to an embodiment of the present invention, and FIG. 2 shows a noise reduction device according to an embodiment of the present invention. In FIG. 1, a pneumatic tire includes a tread portion 1 that extends in the tire circumferential direction and has an annular shape, a pair of sidewall portions 2 disposed on both sides of the tread portion 1, and tires of these sidewall portions 2. And a pair of bead portions 3 arranged on the radially inner side. A ring-shaped noise reduction device 10 shown in FIG. 2 is mounted in the cavity 4 surrounded by the tread portion 1, the sidewall portion 2, and the bead portion 3. The noise reduction device 10 is disposed in a region corresponding to the tread portion 1 of the tire inner surface 5.

騒音低減装置１０は、熱可塑性樹脂からなるバンド部材１１と、多孔質材料からなる複数個の吸音材１２とから構成されている。バンド部材１１はタイヤ内面５に沿うように環状に成形され、吸音材１２はバンド部材１１の周方向に沿って互いに間隔をおいて該バンド部材１１に対して接合されている。これら吸音材１２は多数の内部セルを有し、その多孔質構造に基づく所定の吸音特性を有している。吸音材１２の多孔質材料としては発泡ポリウレタンを用いると良い。バンド部材１１は弾性復元力に基づいて吸音材１２をタイヤ内面５に保持する。このように構成される騒音低減装置１０は、通常の空気入りタイヤに対して着脱自在であり、その着脱作業が容易である。   The noise reduction device 10 includes a band member 11 made of a thermoplastic resin and a plurality of sound absorbing materials 12 made of a porous material. The band member 11 is formed in an annular shape along the tire inner surface 5, and the sound absorbing material 12 is joined to the band member 11 at intervals from each other along the circumferential direction of the band member 11. These sound absorbing materials 12 have a large number of internal cells and have predetermined sound absorbing characteristics based on the porous structure. As the porous material of the sound absorbing material 12, foamed polyurethane may be used. The band member 11 holds the sound absorbing material 12 on the tire inner surface 5 based on the elastic restoring force. The noise reduction device 10 configured as described above is detachable from a normal pneumatic tire, and the attachment / detachment work is easy.

上記騒音低減装置１０において、バンド部材１１と吸音材１２との接合手段としては、熱可塑性樹脂製の係止部材１３を用いた熱融着が採用されている。即ち、吸音材１２は熱可塑性樹脂製のバンド部材１１と熱可塑性樹脂製の係止部材１３との間に配置され、係止部材１３が吸音材１２を通してバンド部材１１に対して熱融着されている。バンド部材１１の構成材料及び係止部材１３の構成材料には、同種の熱可塑性樹脂、例えば、ポリプロピレンを用いると良い。   In the noise reduction device 10, as a joining means between the band member 11 and the sound absorbing material 12, heat fusion using a locking member 13 made of a thermoplastic resin is employed. That is, the sound absorbing material 12 is disposed between the band member 11 made of thermoplastic resin and the locking member 13 made of thermoplastic resin, and the locking member 13 is heat-sealed to the band member 11 through the sound absorbing material 12. ing. The constituent material of the band member 11 and the constituent material of the locking member 13 may be the same type of thermoplastic resin, for example, polypropylene.

図３（ａ）〜（ｃ）はバンド部材１１に対する吸音材１２の接合方法を示すものである。先ず、図３（ａ）に示すように、吸音材１２をバンド部材１１と板状の係止部材１３との間に配置する。次に、図３（ｂ）に示すように、超音波溶着機の加振ホーン２０を係止部材１３に押し付け、係止部材１３を折り曲げた状態にし、その折り曲げられた部分を局部的に加熱する。これにより、図３（ｃ）に示すように、吸音材１２を通して係止部材１３とバンド部材１１とを熱融着し、複数の係止部材１３により各吸音材１２をバンド部材１１に対して接合する。バンド部材１１と吸音材１２との接合方法としては、上述のような熱融着を用いることが好ましいが、その接合方法は特に限定されるものではなく、例えば、接着剤を使用することも可能である。   3A to 3C show a method of joining the sound absorbing material 12 to the band member 11. First, as shown in FIG. 3A, the sound absorbing material 12 is disposed between the band member 11 and the plate-like locking member 13. Next, as shown in FIG. 3B, the vibration horn 20 of the ultrasonic welder is pressed against the locking member 13 so that the locking member 13 is bent, and the bent portion is locally heated. To do. Thereby, as shown in FIG. 3C, the locking member 13 and the band member 11 are heat-sealed through the sound absorbing material 12, and each sound absorbing material 12 is attached to the band member 11 by the plurality of locking members 13. Join. As a method for joining the band member 11 and the sound absorbing material 12, it is preferable to use the above-mentioned heat fusion, but the joining method is not particularly limited, and for example, an adhesive can be used. It is.

上記騒音低減装置１０において、バンド部材１１の厚さ方向の少なくとも一方の面にはバンド部材１１の周方向に延長する少なくとも１本のリブ１４（突条）が形成され、そのリブ１４がバンド部材１１の周方向の全域に存在するように配置されている。図１及び図２において、リブ１４はバンド部材１１の外周面に配設されている。   In the noise reduction device 10, at least one rib 14 (projection) extending in the circumferential direction of the band member 11 is formed on at least one surface in the thickness direction of the band member 11, and the rib 14 is the band member. 11 are arranged so as to exist in the whole area in the circumferential direction. 1 and 2, the rib 14 is disposed on the outer peripheral surface of the band member 11.

上述のようにバンド部材１１の弾性復元力に基づいて吸音材１２をタイヤ内面５に装着するようにした騒音低減装置１０において、バンド部材１１の厚さ方向の少なくとも一方の面にバンド部材１０の周方向に延長する少なくとも１本のリブ１４を設け、そのリブ１４をバンド部材１１の周方向の全域に存在するように配置したことにより、バンド部材１１の厚さを減少させた場合であっても、リブ１４に基づいてバンド部材１１の曲げ剛性を十分に確保することができる。そのため、吸音材１２をタイヤ内面５に固定する機能を損なうことなく騒音低減装置１０の軽量化を図ることができる。   In the noise reduction device 10 in which the sound absorbing material 12 is attached to the tire inner surface 5 based on the elastic restoring force of the band member 11 as described above, the band member 10 is provided on at least one surface in the thickness direction of the band member 11. This is a case where the thickness of the band member 11 is reduced by providing at least one rib 14 extending in the circumferential direction and arranging the rib 14 so as to exist in the entire circumferential direction of the band member 11. In addition, the bending rigidity of the band member 11 can be sufficiently secured based on the ribs 14. Therefore, the noise reduction device 10 can be reduced in weight without impairing the function of fixing the sound absorbing material 12 to the tire inner surface 5.

特に、リブ１４をバンド部材１１の外周面に配置した場合、リブ１４がタイヤ内面５に当接する一方で、バンド部材１１はタイヤ内面５に対して直接接触しなくなるため、タイヤ内面５からバンド部材１１への熱伝達が抑制され、熱に起因してバンド部材１１の剛性が低下するのを抑制することができる。   In particular, when the rib 14 is disposed on the outer peripheral surface of the band member 11, the rib 14 contacts the tire inner surface 5, while the band member 11 does not directly contact the tire inner surface 5. The heat transfer to 11 can be suppressed, and the rigidity of the band member 11 can be prevented from decreasing due to heat.

上記騒音低減装置１０において、図４〜図８に示すように、リブ１４はバンド部材１１の周方向（長手方向）の全域にわたって連続した構造を有するものであると良い。リブ１４が周方向の途中で途切れていると、その部分に応力が集中してバンド部材１１が破壊され易くなるが、リブ１４が連続した構造を有することにより、応力集中を回避し、良好な補強効果を得ることができる。なお、帯状部材の両端部を互いに接合することで環状のバンド部材１１を成形する場合、その接合部（スプライス部）においては不可避的にリブ１４が不連続となることがある。そのような場合、リブ１４はバンド部材１１のスプライス部を除く領域で連続した構造を有していれば良い。バンド部材１１のスプライス部は必要に応じて補強することができる。   In the noise reduction device 10, as shown in FIGS. 4 to 8, the rib 14 may have a continuous structure over the entire circumferential direction (longitudinal direction) of the band member 11. If the rib 14 is interrupted in the middle of the circumferential direction, stress concentrates on the portion and the band member 11 is easily broken. However, the rib 14 has a continuous structure, thereby avoiding stress concentration and good. A reinforcing effect can be obtained. In addition, when the cyclic | annular band member 11 is shape | molded by joining the both ends of a strip | belt-shaped member mutually, the rib 14 may be inevitably discontinuous in the junction part (splice part). In such a case, the rib 14 should just have the structure continuous in the area | region except the splice part of the band member 11. FIG. The splice portion of the band member 11 can be reinforced as necessary.

図４（ａ），（ｂ）において、バンド部材１１の一方の面にはバンド部材１１の周方向（長手方向）の全域にわたって連続した構造を有する１本のリブ１４が形成され、そのリブ１４がバンド部材１１の周方向に沿って直線状に延在している。   4A and 4B, a single rib 14 having a continuous structure over the entire circumferential direction (longitudinal direction) of the band member 11 is formed on one surface of the band member 11, and the rib 14 Extends linearly along the circumferential direction of the band member 11.

図５（ａ），（ｂ）において、バンド部材１１の一方の面にはバンド部材１１の周方向（長手方向）の全域にわたって連続した構造を有する２本のリブ１４が形成され、これらリブ１４がバンド部材１１の幅方向の両端部においてバンド部材１１の周方向に沿って直線状に延在している。このような形態によれば、バンド部材１１を効果的に補強することができ、しかも２本のリブ１４をタイヤ内面５に当接させることでバンド部材１１を安定した状態で設置することができる。   5A and 5B, two ribs 14 having a continuous structure over the entire circumferential direction (longitudinal direction) of the band member 11 are formed on one surface of the band member 11. Is extending linearly along the circumferential direction of the band member 11 at both ends in the width direction of the band member 11. According to such a form, the band member 11 can be effectively reinforced, and the band member 11 can be installed in a stable state by bringing the two ribs 14 into contact with the tire inner surface 5. .

図６（ａ），（ｂ）において、バンド部材１１の一方の面にはバンド部材１１の周方向（長手方向）の全域にわたって連続した構造を有する１本のリブ１４が形成され、そのリブ１４がバンド部材１１の周方向に沿ってジグザグ状に延在している。このようにジグザグ状に延在するリブ１４をタイヤ内面５に当接させることでバンド部材１１を安定した状態で設置することができる。   6A and 6B, a single rib 14 having a continuous structure over the entire circumferential direction (longitudinal direction) of the band member 11 is formed on one surface of the band member 11. Extends in a zigzag shape along the circumferential direction of the band member 11. Thus, the band member 11 can be installed in a stable state by bringing the ribs 14 extending in a zigzag shape into contact with the tire inner surface 5.

図７（ａ），（ｂ）において、バンド部材１１の一方の面にはバンド部材１１の周方向（長手方向）の全域にわたって連続した構造を有する１本のリブ１４が形成され、そのリブ１４の幅がバンド部材１１の周上で変化している。また、図８（ａ），（ｂ）において、バンド部材１１の一方の面にはバンド部材１１の周方向（長手方向）の全域にわたって連続した構造を有する１本のリブ１４が形成され、そのリブ１４の高さがバンド部材１１の周上で変化している。リブ１４の高さ又は幅が周上で変化する場合、リブ１４の高さ及び幅の周上での変化量（最小値と最大値との差）はそれぞれ最小値の２０％以下、より好ましくは１０％以下であると良い。最も好ましい形態は、リブ１４の高さ及び幅がバンド部材１１の周上で一定となる場合である。リブ１４の高さ及び幅の周上での変化量が大きくなると、バンド部材１１の周方向の剛性変化が大きくなり応力集中が起き易くなるが、その変化量を規制することで応力集中を回避することができる。このことはバンド部材１１の耐久性の向上に寄与する。   7A and 7B, one rib 14 having a continuous structure over the entire circumferential direction (longitudinal direction) of the band member 11 is formed on one surface of the band member 11, and the rib 14 Is changed on the circumference of the band member 11. 8 (a) and 8 (b), a single rib 14 having a continuous structure over the entire circumferential direction (longitudinal direction) of the band member 11 is formed on one surface of the band member 11. The height of the rib 14 changes on the circumference of the band member 11. When the height or width of the rib 14 changes on the circumference, the amount of change (the difference between the minimum value and the maximum value) on the circumference of the height and width of the rib 14 is preferably 20% or less of the minimum value, respectively. Is preferably 10% or less. The most preferred form is when the height and width of the ribs 14 are constant on the circumference of the band member 11. When the amount of change in the circumference of the height and width of the rib 14 increases, the rigidity change in the circumferential direction of the band member 11 increases and stress concentration easily occurs. However, stress concentration is avoided by regulating the amount of change. can do. This contributes to improvement in durability of the band member 11.

リブ１４の合計幅Ｗ１はバンド部材１１の幅Ｗ０の２％〜３０％とし、リブ１４の高さＴ１はバンド部材１１の厚さＴ０の２０％〜４００％とすることが好ましい（図４参照）。バンド部材１１が１本のリブ１４を備える場合、その１本のリブ１４の幅が合計幅Ｗ１となるが、バンド部材１１が複数本のリブ１４を備える場合、その複数本のリブ１４の幅の合計が合計幅Ｗ１となる。リブ１４の合計幅Ｗ１及び高さＴ１を上記範囲に設定することにより、バンド部材１１の耐久性を良好に維持しながら、リブ１４に基づくバンド部材１１の補強効果を十分に確保することができる。ここで、リブ１４の合計幅Ｗ１が小さ過ぎると補強効果が不十分になり、逆に大き過ぎると曲げ剛性が過大となるため耐久性が低下することになる。また、リブ１４の高さＴ１が小さ過ぎると補強効果が不十分になり、逆に大き過ぎると曲げ剛性が過大となるため耐久性が低下することになる。また、リブ１４をバンド部材１１の外周面に配置した場合において、リブ１４の高さＴ１が大き過ぎると、吸音材１２がタイヤ内面５から大きく離間し、吸音材１２が走行に伴って変形し易くなるため、吸音材１２が損傷し易くなる。   The total width W1 of the ribs 14 is preferably 2% to 30% of the width W0 of the band member 11, and the height T1 of the ribs 14 is preferably 20% to 400% of the thickness T0 of the band member 11 (see FIG. 4). ). When the band member 11 includes one rib 14, the width of the one rib 14 is the total width W <b> 1, but when the band member 11 includes a plurality of ribs 14, the width of the plurality of ribs 14. Is the total width W1. By setting the total width W1 and height T1 of the ribs 14 within the above ranges, the reinforcing effect of the band member 11 based on the ribs 14 can be sufficiently ensured while maintaining the durability of the band member 11 satisfactorily. . Here, if the total width W1 of the ribs 14 is too small, the reinforcing effect is insufficient. Conversely, if the total width W1 is too large, the bending rigidity becomes excessive and the durability is lowered. On the other hand, if the height T1 of the rib 14 is too small, the reinforcing effect is insufficient. Conversely, if the rib 14 is too large, the bending rigidity becomes excessive and the durability is lowered. Further, when the rib 14 is disposed on the outer peripheral surface of the band member 11, if the height T1 of the rib 14 is too large, the sound absorbing material 12 is greatly separated from the tire inner surface 5, and the sound absorbing material 12 is deformed with traveling. Therefore, the sound absorbing material 12 is easily damaged.

なお、バンド部材１１の幅Ｗ０は１５ｍｍ〜７０ｍｍの範囲に設定し、バンド部材１１の厚さＴ０は０．７ｍｍ〜３．０ｍｍの範囲に設定することが望ましい。これにより、空気入りタイヤに装着される騒音低減装置１０において、吸音材１２をタイヤ内面にしっかりと保持することができる。ここで、バンド部材１１の幅Ｗ０又は厚さＴ０が小さ過ぎるとバンド部材１１の強度が不十分になり、逆に大き過ぎると曲げ剛性が過大となるため耐久性が低下する。   The width W0 of the band member 11 is preferably set in the range of 15 mm to 70 mm, and the thickness T0 of the band member 11 is preferably set in the range of 0.7 mm to 3.0 mm. Thereby, in the noise reduction device 10 mounted on the pneumatic tire, the sound absorbing material 12 can be securely held on the tire inner surface. Here, if the width W0 or the thickness T0 of the band member 11 is too small, the strength of the band member 11 becomes insufficient. Conversely, if the band member 11 is too large, the bending rigidity becomes excessive and durability is lowered.

上記騒音低減装置１０において、図９〜図１１に示すように、リブ１４をバンド部材１１の周長よりも短い複数のリブ片１４Ｘから構成することも可能である。この場合、バンド部材１１の周方向（長手方向）に隣り合うリブ片１４Ｘ，１４Ｘ同士を互いに周方向に重複するように配置すると良い。これにより、リブ１４が途切れた部位に応力が集中するのを可及的に回避することができる。   In the noise reduction device 10, as shown in FIGS. 9 to 11, the ribs 14 can be composed of a plurality of rib pieces 14 </ b> X shorter than the circumferential length of the band member 11. In this case, the rib pieces 14X and 14X adjacent to each other in the circumferential direction (longitudinal direction) of the band member 11 may be arranged so as to overlap each other in the circumferential direction. Thereby, it can avoid as much as possible that stress concentrates on the site | part in which the rib 14 interrupted.

図９（ａ），（ｂ）において、バンド部材１１の一方の面には複数のリブ片１４Ｘからなるリブ１４が形成され、バンド部材１１の周方向（長手方向）に隣り合うリブ片１４Ｘ，１４Ｘが互いに周方向に重複するように配置されている。リブ片１４Ｘはバンド部材１１の幅方向の２箇所に分散するように配置され、各リブ片１４Ｘがバンド部材１１の長手方向と平行に延長している。   9A and 9B, a rib 14 including a plurality of rib pieces 14X is formed on one surface of the band member 11, and the rib pieces 14X adjacent to each other in the circumferential direction (longitudinal direction) of the band member 11 are formed. 14X are arrange | positioned so that it may mutually overlap in the circumferential direction. The rib pieces 14 </ b> X are arranged so as to be distributed in two places in the width direction of the band member 11, and each rib piece 14 </ b> X extends in parallel with the longitudinal direction of the band member 11.

図１０（ａ），（ｂ）において、バンド部材１１の一方の面には複数のリブ片１４Ｘからなるリブ１４が形成され、バンド部材１１の周方向（長手方向）に隣り合うリブ片１４Ｘ，１４Ｘが互いに周方向に重複するように配置されている。リブ片１４Ｘはバンド部材１１の幅方向の３箇所に分散するように配置され、各リブ片１４Ｘがバンド部材１１の長手方向と平行に延長している。   10 (a) and 10 (b), a rib 14 composed of a plurality of rib pieces 14X is formed on one surface of the band member 11, and the rib pieces 14X adjacent to each other in the circumferential direction (longitudinal direction) of the band member 11 are formed. 14X are arrange | positioned so that it may mutually overlap in the circumferential direction. The rib pieces 14 </ b> X are arranged so as to be distributed at three positions in the width direction of the band member 11, and each rib piece 14 </ b> X extends in parallel with the longitudinal direction of the band member 11.

図１１（ａ），（ｂ）において、バンド部材１１の一方の面には複数のリブ片１４Ｘからなるリブ１４が形成され、バンド部材１１の周方向（長手方向）に隣り合うリブ片１４Ｘ，１４Ｘが互いに周方向に重複するように配置されている。各リブ片１４Ｘはバンド部材１１の長手方向に対して傾斜している。   11 (a) and 11 (b), a rib 14 including a plurality of rib pieces 14X is formed on one surface of the band member 11, and the rib pieces 14X adjacent to each other in the circumferential direction (longitudinal direction) of the band member 11 are formed. 14X are arrange | positioned so that it may mutually overlap in the circumferential direction. Each rib piece 14 </ b> X is inclined with respect to the longitudinal direction of the band member 11.

図９〜図１１の形態において、リブ片１４Ｘ同士のタイヤ周方向の重なり量は特に限定されるものではないが、その重なり量が過大であるとバンド部材１１の全体としての曲げ剛性が過剰になり、また、重量増加にも繋がる。そのため、リブ片１４Ｘ同士のタイヤ周方向の重なり量は最小限に抑えるのが良い。例えば、リブ片１４Ｘ同士のタイヤ周方向の重なり量の総和はバンド部材１１の周長の３０％以下に規制することが好ましい。   9 to 11, the overlapping amount of the rib pieces 14 </ b> X in the tire circumferential direction is not particularly limited, but if the overlapping amount is excessive, the bending rigidity of the entire band member 11 is excessive. It also leads to an increase in weight. Therefore, it is preferable to minimize the overlapping amount of the rib pieces 14X in the tire circumferential direction. For example, the total sum of the overlapping amounts of the rib pieces 14 </ b> X in the tire circumferential direction is preferably regulated to 30% or less of the circumferential length of the band member 11.

上記騒音低減装置１０において、リブ１４をバンド部材１１の外周面に配置するにあたって、リブ１４のタイヤ内面５に接触する部分には面取り加工を施すことが好ましい。図１２においては、リブ１４のタイヤ内面５に接触する部分に所定の曲率半径を有する曲面からなる面取り部１５Ａが形成されている。また、図１３においては、リブ１４のタイヤ内面５に接触する部分に平面からなる面取り部１５Ｂが形成されている。これにより、リブ１４の接触によるタイヤ内面５の損傷を軽減し、空気入りタイヤの耐久性を向上するができる。   In the noise reduction device 10, when the rib 14 is disposed on the outer peripheral surface of the band member 11, it is preferable to chamfer the portion of the rib 14 that contacts the tire inner surface 5. In FIG. 12, a chamfered portion 15 </ b> A made of a curved surface having a predetermined radius of curvature is formed at a portion of the rib 14 that contacts the tire inner surface 5. In FIG. 13, a chamfered portion 15 </ b> B having a flat surface is formed at a portion of the rib 14 that contacts the tire inner surface 5. Thereby, the damage of the tire inner surface 5 due to the contact of the ribs 14 can be reduced, and the durability of the pneumatic tire can be improved.

タイヤ内面に沿うように環状に成形された熱可塑性樹脂からなるバンド部材と、該バンド部材に対して接合された多孔質材料からなる吸音材とを有し、バンド部材の弾性復元力に基づいて吸音材をタイヤ内面に装着するようにした騒音低減装置において、バンド部材の構成を種々異ならせた従来例、比較例１，２及び実施例１〜６の騒音低減装置を製作した。これら騒音低減装置はタイヤサイズ２４５／４０Ｒ１８の空気入りタイヤに適合するものである。   Based on the elastic restoring force of the band member, including a band member made of a thermoplastic resin formed in an annular shape along the inner surface of the tire, and a sound absorbing material made of a porous material joined to the band member In the noise reduction device in which the sound absorbing material is attached to the inner surface of the tire, the noise reduction devices of the conventional examples, comparative examples 1 and 2 and examples 1 to 6 in which the configurations of the band members are variously manufactured were manufactured. These noise reduction devices are suitable for pneumatic tires of tire size 245 / 40R18.

従来例では、バンド部材の幅を２０ｍｍとし、バンド部材の厚さを１．０ｍｍとした。比較例１では、バンド部材の幅を２０ｍｍとし、バンド部材の厚さを０．８ｍｍとした。比較例２では、バンド部材の幅を２０ｍｍとし、バンド部材の厚さを０．８ｍｍとすると共に、バンド部材の外周面にバンド部材の周方向に沿って延長するリブを設け、該リブをバンド部材の周長よりも短い１５本のリブ片から構成し、これらリブ片を互いに周方向に離間させることでリブをバンド部材の周方向の９０％の領域に存在するように配置した。   In the conventional example, the width of the band member is 20 mm, and the thickness of the band member is 1.0 mm. In Comparative Example 1, the width of the band member was 20 mm, and the thickness of the band member was 0.8 mm. In Comparative Example 2, the width of the band member is set to 20 mm, the thickness of the band member is set to 0.8 mm, and a rib extending along the circumferential direction of the band member is provided on the outer peripheral surface of the band member. The rib members were composed of 15 rib pieces shorter than the circumferential length of the member, and these rib pieces were spaced apart from each other in the circumferential direction so that the ribs were arranged in a region of 90% in the circumferential direction of the band member.

実施例１〜４では、バンド部材の幅を２０ｍｍとし、バンド部材の厚さを０．６ｍｍ〜０．８ｍｍとすると共に、バンド部材の外周面にバンド部材の周方向に沿って連続的に延長する１本のリブ（図４参照）を設け、該リブをバンド部材の周方向の全域に存在するように配置し、リブの幅及び高さを種々異ならせた。   In Examples 1 to 4, the width of the band member is set to 20 mm, the thickness of the band member is set to 0.6 mm to 0.8 mm, and the band member is continuously extended along the circumferential direction of the band member. One rib (refer to FIG. 4) is provided, and the rib is disposed so as to exist in the entire circumferential direction of the band member, and the width and height of the rib are varied.

実施例５では、バンド部材の幅を２０ｍｍとし、バンド部材の厚さを０．５ｍｍとすると共に、バンド部材の外周面にバンド部材の周方向に沿って連続的に延長する２本のリブ（図５参照）を設け、該リブをバンド部材の周方向の全域に存在するように配置した。各リブの幅は２ｍｍとした。   In the fifth embodiment, the width of the band member is set to 20 mm, the thickness of the band member is set to 0.5 mm, and two ribs continuously extending along the circumferential direction of the band member on the outer peripheral surface of the band member ( 5), and the ribs were disposed so as to exist in the entire circumferential direction of the band member. The width of each rib was 2 mm.

実施例６では、バンド部材の幅を２０ｍｍとし、バンド部材の厚さを０．８ｍｍとすると共に、バンド部材の外周面にバンド部材の周方向に延長するリブを設け、該リブをバンド部材の周長よりも短い１５本のリブ片（図１１参照）から構成し、バンド部材の周方向に隣り合うリブ片を互いに周方向に重複するように配置することで該リブをバンド部材の周方向の全域に存在するように配置した。これらリブ片はバンド部材の周方向に対して斜めに配置し、各リブ片の幅は１ｍｍとした。   In Example 6, the width of the band member is 20 mm, the thickness of the band member is 0.8 mm, and a rib extending in the circumferential direction of the band member is provided on the outer peripheral surface of the band member, and the rib is formed on the band member. The rib member is composed of 15 rib pieces (see FIG. 11) shorter than the circumferential length, and the rib pieces adjacent to each other in the circumferential direction of the band member are arranged so as to overlap each other in the circumferential direction. It arranged so that it might exist in the whole area. These rib pieces were disposed obliquely with respect to the circumferential direction of the band member, and the width of each rib piece was 1 mm.

上述した従来例、比較例１，２及び実施例１〜６の騒音低減装置について、下記の評価方法により、吸音材の保持性能、耐久性、バンド重量を評価した。その結果を表１に示す。   About the noise reduction apparatus of the prior art example mentioned above, the comparative examples 1 and 2, and Examples 1-6, the holding performance of the sound-absorbing material, durability, and the band weight were evaluated by the following evaluation method. The results are shown in Table 1.

吸音材の保持性能：
各騒音低減装置を空気入りタイヤの空洞部内に装着し、タイヤ内面への吸音材の保持性能を調べた。評価結果は、バンド部材の剛性が十分であり、吸音材がタイヤ内面に対してしっかりと保持される場合を「Ａ」で示し、バンド部材に剛性に基づいて吸音材がタイヤ内面に対して保持される場合を「Ｂ」で示し、バンド部材の剛性が不足し、吸音材が保持されずにタイヤ内面から脱落する場合を「Ｃ」で示した。 Sound absorbing material retention performance:
Each noise reduction device was installed in the cavity of a pneumatic tire, and the holding performance of the sound absorbing material on the tire inner surface was examined. The evaluation result is indicated by “A” when the band member has sufficient rigidity and the sound absorbing material is firmly held against the tire inner surface, and the band member holds the sound absorbing material against the tire inner surface based on the rigidity. The case where it is done is indicated by “B”, and the case where the band member lacks rigidity and the sound absorbing material falls off from the tire inner surface without being held is indicated by “C”.

耐久性：
各騒音低減装置をタイヤサイズ２４５／４０Ｒ１８の空気入りタイヤの空洞部内に装着し、その空気入りタイヤをリムサイズ１８×９ＪＪのホイールに組み付け、室内ドラム試験機を用いて空気圧２５０ｋＰａ、荷重４．８ｋＮ、速度８０ｋｍ／ｈの条件にて走行試験を実施し、騒音低減装置が破壊されるまでの走行距離を計測した。走行距離が２００００ｋｍ以上となったものを合格とする。評価結果は、走行距離が合格判定距離の２倍以上である場合を「Ｓ」で示し、走行距離が合格判定距離の１．５倍以上である場合を「Ａ」で示し、走行距離が合格判定距離以上である場合を「Ｂ」で示し、走行距離が合格判定距離未満である場合を「Ｃ」で示した。 durability:
Each noise reduction device is mounted in a hollow portion of a pneumatic tire of tire size 245 / 40R18, the pneumatic tire is assembled to a wheel of rim size 18 × 9 JJ, an air pressure of 250 kPa, a load of 4.8 kN using an indoor drum tester, A running test was conducted under the condition of a speed of 80 km / h, and the running distance until the noise reduction device was destroyed was measured. If the mileage is 20000 km or more, it will be accepted. The evaluation result is indicated by “S” when the travel distance is twice or more of the pass determination distance, and indicated by “A” when the travel distance is 1.5 times or more of the pass determination distance. A case where the distance is equal to or greater than the determination distance is indicated by “B”, and a case where the travel distance is less than the acceptable determination distance is indicated by “C”.

バンド重量：
各騒音低減装置のバンド部材の重量を計測し、従来例を１００とする指数にて示した。この指数値が小さいほど軽量であることを意味する。 Band weight:
The weight of the band member of each noise reduction device was measured and indicated by an index with the conventional example being 100. A smaller index value means a lighter weight.

Figure 0006428046
Figure 0006428046

表１に示すように、実施例１〜６の騒音低減装置では、従来例に対して軽量化されており、しかも吸音材の保持性能と耐久性が良好であった。これに対して、比較例１では、バンド部材がリブなしで薄肉化されているため、タイヤ内面に対して吸音材を保持することができず、耐久性の評価を行うことができなかった。また、比較例２では、バンド部材の外周面にバンド部材の周方向に沿って断続的に延長するリブを設け、該リブをバンド部材の周方向の９０％の領域に存在するように配置しているため、騒音低減装置の耐久性が不十分であった。   As shown in Table 1, in the noise reduction apparatuses of Examples 1 to 6, the weight was reduced compared to the conventional example, and the sound absorbing material holding performance and durability were good. On the other hand, in Comparative Example 1, since the band member was thinned without ribs, the sound absorbing material could not be held on the tire inner surface, and durability could not be evaluated. Further, in Comparative Example 2, a rib extending intermittently along the circumferential direction of the band member is provided on the outer circumferential surface of the band member, and the rib is disposed so as to exist in an area of 90% in the circumferential direction of the band member. Therefore, the durability of the noise reduction device was insufficient.

１ トレッド部
２ ビード部
３ サイドウォール部
４ 空洞部
５ タイヤ内面
１０ 騒音低減装置
１１ バンド部材
１２ 吸音材
１３ 係止部材
１４ リブ
１４Ｘ リブ片
１５Ａ，１５Ｂ 面取り部 DESCRIPTION OF SYMBOLS 1 Tread part 2 Bead part 3 Side wall part 4 Cavity part 5 Tire inner surface 10 Noise reduction apparatus 11 Band member 12 Sound-absorbing material 13 Locking member 14 Rib 14X Rib piece 15A, 15B Chamfer

Claims (6)

タイヤ内面に沿うように環状に成形された熱可塑性樹脂からなるバンド部材と、該バンド部材に対して接合された多孔質材料からなる吸音材とを有し、前記バンド部材の弾性復元力に基づいて前記吸音材をタイヤ内面に装着するようにした騒音低減装置において、前記バンド部材の厚さ方向の少なくとも一方の面に該バンド部材の周方向に延長する少なくとも１本のリブを設け、該リブを前記バンド部材の周方向の全域に存在するように配置すると共に、前記リブを前記バンド部材の外周面に配置し、前記リブのタイヤ内面に接触する部分に面取り加工を施したことを特徴とする騒音低減装置。 A band member made of a thermoplastic resin formed in an annular shape along the tire inner surface, and a sound absorbing material made of a porous material joined to the band member, and based on the elastic restoring force of the band member In the noise reduction device in which the sound absorbing material is attached to the inner surface of the tire, at least one rib extending in the circumferential direction of the band member is provided on at least one surface in the thickness direction of the band member, and the rib Is disposed so as to exist in the entire circumferential direction of the band member, the rib is disposed on the outer peripheral surface of the band member, and a chamfering process is performed on a portion of the rib contacting the tire inner surface. To reduce noise. 前記リブが前記バンド部材の周方向の全域にわたって連続した構造を有することを特徴とする請求項１に記載の騒音低減装置。   The noise reduction device according to claim 1, wherein the rib has a continuous structure over the entire circumferential direction of the band member. 前記リブが前記バンド部材の周長よりも短い複数のリブ片からなり、前記バンド部材の周方向に隣り合うリブ片を互いに周方向に重複するように配置したことを特徴とする請求項１に記載の騒音低減装置。   The rib is composed of a plurality of rib pieces shorter than the circumferential length of the band member, and the rib pieces adjacent in the circumferential direction of the band member are arranged so as to overlap each other in the circumferential direction. The noise reduction device described. 前記リブの高さ及び幅の周上での変化量がそれぞれ最小値の２０％以下であることを特徴とする請求項１〜３のいずれかに記載の騒音低減装置。 The noise reduction device according to any one of claims 1 to 3 , wherein the amount of change in the circumference of the height and width of the rib is 20% or less of the minimum value. 前記リブの合計幅が前記バンド部材の幅の２％〜３０％であり、前記リブの高さが前記バンド部材の厚さの２０％〜４００％であることを特徴とする請求項１〜４のいずれかに記載の騒音低減装置。 The total width of the rib is 2% to 30% of the width of the band member, according to claim 1-4 in which the height of the rib is characterized in that 20% to 400% of the thickness of the band member The noise reduction apparatus in any one of. 請求項１〜５のいずれかに記載の騒音低減装置を空洞部内に備えたことを特徴とする空気入りタイヤ。 A pneumatic tire comprising the noise reduction device according to any one of claims 1 to 5 in a hollow portion.
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